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Aggregate address and summary address?

Can some one tel me what is aggregate address in BGP and summary address in eigrp and ospf.

Is aggregate address and summary address same or different?

Thanks,

SATHYA

2 REPLIES
VIP Super Bronze

Aggregate address and summary address?

They are the same.  With BGP you can use aggregate and summary in the same line.

http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfbgp1.html#wp1017390

HTH

Purple

Aggregate address and summary address?

Hi,

there is one difference though,  when a summary- address is configured in EIGRP or OSPF the subnets comprising the summary are not advertised, you can do it in EIGRP with a leak-map but not in OSPF as far as I know.

In BGP the default with the aggregate-address is to also send the subnets part of the summary and you can disable this with the summary-only keyword.

I don't know of any summary-address  command in BGP but you can summarize at classful boundary with the auto-summary command but it is working differently from IGP and also wheter you are using network commands or redistributing the prefixes.

Regards.

Alain

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